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TECHNICAL PAPERS

Ejector Irreversibility Characteristics

[+] Author and Article Information
A. Arbel, A. Shklyar, M. Barak

Institute of Agricultural Engineering, Agricultural Research Organization, The Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel

D. Hershgal, M. Sokolov

Department of Fluid Mechanics and Heat Transfer, Tel-Aviv University, Ramat Aviv 69978, Israel

J. Fluids Eng 125(1), 121-129 (Jan 22, 2003) (9 pages) doi:10.1115/1.1523067 History: Received September 15, 2000; Revised June 28, 2002; Online January 22, 2003
Copyright © 2003 by ASME
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References

Figures

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Schematic view of a fixed geometry ejector
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Schematic diagram of a mixer mechanism control volume
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Schematic view of a turbine compressor
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Theoretical results as functions of the mixing pressure (Px), where ω=2,τ=0.5,P0p/P0s=100, and k=1.4. (a) Mach numbers of the primary and the secondary streams at cross section x(M and M, respectively), and of the mixed stream at cross sections 1 and 2 (M1 and M2, respectively); (b) pressure at cross sections 1, 2, and 3, and the stagnation pressure at cross section 1.
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Schematic view of an ejector with adjustable throat
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Theoretical results of a “fixed ejector,” and an “adjustable throat ejector,” as functions of the mixing pressure (Px), where ω=2,τ=0.5,P0p/P0s=100 and k=1.4. (a) Entropy generation; (b) relative performance; (c) efficiency.
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Theoretical results of an “optimal fixed ejector,” an ideal turbine compressor, and an “adjustable throat ejector with optimal starting conditions,” as functions of the inlet flow rate ratio (ω), where τ=1,P0p/P0s=100 and k=1.4. (a) Entropy generation; (b) relative performance; (c) efficiency.
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Theoretical results of an “optimal fixed ejector,” an ideal turbine compressor, and an “adjustable throat ejector with optimal starting conditions,” as functions of the inlet temperature ratio (τ), where ω=1,P0p/P0s=100 and k=1.4. (a) Entropy generation; (b) relative performance; (c) efficiency.
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Theoretical efficiency of an “optimal fixed ejector,” an ideal turbine compressor, and an “adjustable throat ejector with optimal starting conditions,” as functions of the inlet pressure ratio (P0p/P0s), where τ=0.5,ω=1 and k=1.4
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Theoretical efficiency of an “optimal fixed ejector,” an ideal turbine compressor, and “adjustable throat ejector with optimal starting conditions,” as functions of the gas specific heat ratio (k), where τ=0.5,ω=1, and P0p/P0s=100
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Theoretical efficiency of an “optimal fixed ejector,” an ideal turbine compressor, and “adjustable throat ejector with optimal starting conditions,” as functions of the inlet flow rate ratio (ω), where (a) τ=1,P0p/P0s=50 and k=1.4; (b) τ=1,P0p/P0s=200 and k=1.4; (c) τ=1,P0p/P0s=100 and k=1.1; and (d) τ=1,P0p/P0s=100 and k=1.7
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Theoretical efficiency of “an optimal fixed ejector,” an ideal turbine compressor, and “adjustable throat ejector with optimal starting conditions,” as functions of the inlet temperature ratio (τ), where (a) ω=1,P0p/P0s=50 and k=1.4; (b) ω=1,P0p/P0s=200 and k=1.4; (c) ω=1,P0p/P0s=100 and k=1.1; and (d) ω=1,P0p/P0s=100 and k=1.7
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Reversible process on pressure-enthalpy diagram

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